CN102671940B - Rolling method for producing phase changes in finish rolling process of low-grade non-oriented silicon steel - Google Patents
Rolling method for producing phase changes in finish rolling process of low-grade non-oriented silicon steel Download PDFInfo
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- CN102671940B CN102671940B CN201210161390.1A CN201210161390A CN102671940B CN 102671940 B CN102671940 B CN 102671940B CN 201210161390 A CN201210161390 A CN 201210161390A CN 102671940 B CN102671940 B CN 102671940B
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Abstract
The invention provides a rolling method for producing phase changes in the finish rolling process of low-grade non-oriented silicon steel, which belongs to the technical field of steel rolling and is characterized in that the target tapping temperature of a first heating zone of a heating furnace is minus 50 DEG C +/- 30 DEG C, the target tapping temperature of a second heating zone of the heating furnace is 20 DEG C +/- 30 DEG C, and the target tapping temperature of a soaking zone of the heating furnace is +/- 30 DEG C; the rolled thickness of a rough mill is adjusted to 40mm, the outlet temperature of the rough mill is adjusted to be in the range of 950 DEG C to 990 DEG C, and the fifth-pass speed of the rough mill is great than or equal to 4.7m/s; the percentages of reduction of first three racks of a finish milling group are all in the range of 59 percent to 37 percent, and the rolled thicknesses of the first three racks are all in the range of 20mm to 6.5mm; and the inlet temperatures of the first three racks are all in the range of 930 DEG C to 900 DEG C, and the rolling speeds of the first three racks are all in the range of 0.9m/s to 2.9m/s. By adopting the rolling method, the second flow among the racks of the finish mill is prevented from being influenced by changes of the deformation resistance, relative balance is maintained, the rolling stability is improved and safety production is guaranteed.
Description
technical field:
The invention belongs to technical field of steel rolling, low grade non-oriented silicon steel refers to DW60, DW47 silicon steel.
background technology:
Low grade non-oriented silicon steel kind, complex process in the time of hot continuous rolling, main heat processing technique process is divided into strand heating, roughing mill rolling, seven frame finishing mill tandem rollings, batches rolling, packs shipping.
Due to low grade non-oriented silicon steel steel grade characteristic, for ensureing to obtain good finished surface quality, eliminate finished surface watt rib shape defect, in the tandem mill operation of rolling, must in the time of finishing stands rolling, produce phase transformation, so, because same steel when the finish rolling rolling will carry out the transformation between γ and alpha phase zone, between two blocks of steel because of inconsistent between component difference phase change zone, cause same steel front and back section, piece and interblock resistance of deformation significantly change, draught pressure is produced significantly to be changed, actual draught pressure changes 30%～50% according to statistics, indivedual periods have occurred that pressure differs 80% situation.
In the time that actual draught pressure changes, system can regulate actual roller gap position automatically, actual draught pressure is approached and set draught pressure, like this in the time that blank deformation drag changes, cause milling train deformation rate, exit thickness, the parameters such as mill speed fluctuate widely, destroy second flow balance between frame, in the time that draught pressure variation 30% is above, exceed automatic adjustable range, expose as-rolled condition unstable, kink significantly swings, band steel can not stable operation in finishing stand, heap steel, draw steel, roll rotten, between frame, steel scrap accident constantly occurs, reduce operating rate.
summary of the invention:
In order to improve rolling stability, prevent from rolling rotten, steel scrap accident, improve lumber recovery, improve operating rate, the invention provides the control method for rolling of low grade non-oriented silicon steel in the time of finishing stands phase transformation.
technical scheme of the present invention:
1, heating furnace burns steel technique: heating furnace comes into operation 3～4, because of hot continuous rolling produce steel grade more, mainly containing Ni is that stainless steel, Cr are stainless steel, low grade non-oriented silicon steel, high grade non-oriented silicon steel, carbon steel etc., these steel grades heating process in heating furnace is had nothing in common with each other, in the time that heating furnace is produced continuously, low grade non-oriented silicon steel and other steel grade can intersect, and therefore will consider how steel grade ensures the uniformity of the heating-up temperature of low grade non-oriented silicon steel while intersection.
1) due to the heating process temperature difference of each steel grade, for ensureing that low grade non-oriented silicon steel reaches the target of homogeneous heating, thereby adopt the method for carrying out technique sky stove with other steel grade, concrete empty stove control method is as follows:
If the last unit of low grade non-oriented silicon steel rolling steel grade is carbon steel, DW80 silicon steel or stainless steel, the staggered empty stove of our unit's hot rolling material and main body material: the last 4-6 piece of last unit steel packs two stoves into, not empty this two stove continues to pack into our unit's hot rolling material, 5 meters, the empty stove of another stove (or 2 stoves) packs main body material 3 above into be arranged, another two stoves pack into after our unit's hot rolling material empty stove to 3 meter above after the 4th row's three stoves (or 4 stoves) fill together.
Described rolling unit: the steel grade and the quantity that refer to the interior rolling that arranges of life cycle each time of mm finishing mill unit working roll.
Hot rolling material: refer to that each rolling unit has changed mm finishing mill unit working roll and started after production, because the working roll newly changing is cold roller, although done " acyclic homologically trioial ", but the real standard degree of roll is also a unknown number, so will first will roll several the carbon steels that easily roll or mild steel breaker roll gives adjustment, make roll be heat deformable state, hot convexity settles out, be conducive to like this operation of rolling control and adjustment, increase rolling stability.
Main body material: refer to that a rolling unit is interior except hot rolling material, the steel grade material that main body is produced.
If the last unit of low grade non-oriented silicon steel rolling steel grade is the mixed Cr stainless steel unit of rolling, between unit, not empty stove hot rolling material list packs interior 2 of High Purity Steel stove into, after 2 meters, empty stove of another stove, fill remaining hot rolling material with high-purity stove is two, 3 meters, the empty stove of another stove (or 2 stoves) packs above main body material 3 into and arranges the 4th and come into line dress.
If the last unit of low grade non-oriented silicon steel rolling steel grade is the Gao Gui unit of DW35, DW31, DW29, DW27, last rolling unit is last 4 packaged to 2 stoves, after the empty stove 3-5 of another two stoves rice, fill low grade non-oriented silicon steel rolling unit hot rolling material, another 2 stoves install empty stove 3-5 meter Hou Zhuan our unit main body material 3 after last unit and arrange, and 3 meters of above the 4th row's three stoves of the empty stoves of another two stoves fill together.
2) a point bringing-up section, two bringing-up sections, three sections of controls of soaking zone in heating furnace, each section of Control for Kiln Temperature target is:
One bringing-up section: (target temperature-50 of coming out of the stove) ± 30 DEG C
Two bringing-up sections: (target temperature+20 of coming out of the stove) ± 30 DEG C
Soaking zone: target temperature ± 30 DEG C of coming out of the stove
2, roughing mill is shut out to thickness and be adjusted to 40mm, roughing mill outlet temperature is by being adjusted to 950 DEG C～990 DEG C, roughing Wu road speed >=4.7m/s.
3, control mm finishing mill unit each frame reduction ratio, first three frame reduction ratio and shut out thickness:
1) first three frame reduction ratio:
F0～F2 is 59%～37%.Wherein, F0 is the label of the first frame, and F1 is the label of the second frame, and F2 is the label of the 3rd frame;
2) first three frame shuts out thickness (mm):
F0～F2 is 20～6.5.
4, control finish rolling first three frame inlet temperature and mill speed:
1) first three frame inlet temperature:
F0～F2 is 930～900 DEG C.
2) first three frame mill speed (m/s):
F0～F2 is 0.9～2.9.
The present invention, by stablizing between finishing mill phase change zone, is fixed on F0, the generation of F1 frame by phase transformation, and steady-state deformation rate, make the impact that between finishing stand, second flow is significantly changed by resistance of deformation no longer, keep relative equilibrium, improved rolling stability, ensured safety in production.
Detailed description of the invention
Embodiment 1: the milling method of rolling DW60
DW60 strand enters behind hot continuous rolling factory slab storehouse, carries out checking and receiving of slab.According to the production schedule, slab is had bad luck on heating furnace charging roller by crane, by roller-way, slab is delivered to before the heating-furnace of appointment, then by dress steel machine, slab is sent in heating furnace and heated through weighing, after confirmation by shove charge order.
1), in heating furnace, carry out sky stove with other steel grade, empty stove method is as follows:
2), each section of Control for Kiln Temperature is:
One bringing-up section: (target temperature-50 of coming out of the stove) ± 30 DEG C
Two bringing-up sections: (target temperature+20 of coming out of the stove) ± 30 DEG C
Soaking zone: target temperature ± 30 DEG C of coming out of the stove
When heating of plate blank is after design temperature, according to rolling rhythm requirement, by extractor, slab is held out successively, be put on furnace delivery table, be transported to roughing high-pressure water descaling case through roller-way and remove slab scale on surface, be then sent to roughing mill.Slab is rolling 5 passages on roughing mill.
3), roughing mill rolling 5 passage exit thickness 40mm, 965 DEG C of roughing outlet temperatures, roughing Wu road speed is 4.9m/s.
Intermediate blank after roughing rolls through crop flying shear cut made-up belt head, enter mm finishing mill unit after tail and be rolled.
4), first three frame reduction ratio of finish rolling and shut out thickness:
First three frame F0, F1, F2 reduction ratio are respectively: 59%, 40%, 37%.
First three frame F0, F1, F2 shut out thickness (mm) and are respectively 20,15,6.5.
5), control finish rolling first three frame inlet temperature and mill speed:
First three frame F0, F1, F2 inlet temperature are respectively: 930 DEG C, 920 DEG C, 900 DEG C.
First three frame F0, F1, F2 mill speed (m/s) are respectively: 0.9,1.7,2.9.
Being carried out through laminar flow radiator cooler by the band steel on runout table with steel that finishing mill shuts out is cooling, will be cooled to the coiling temperature of regulation by finishing temperature with steel.Cooled band steel is led after centering, pinch roll pinch through coiling machine entrance side, enters into downcoiler and is rolled into coil of strip.Then by coil stripping car, it is shifted out from reel, transport coil of strip to finishing reservoir area buttress by coil conveying chain and walking beam transporter and put.Coil of strip will complete uncoiling, bundling, weighs on step rate, spray printing work.
Embodiment 2: the milling method of rolling DW47
DW47 strand enters behind hot continuous rolling factory slab storehouse, carries out checking and receiving of slab.According to the production schedule, slab is had bad luck on heating furnace charging roller by crane, by roller-way, slab is delivered to before the heating-furnace of appointment, then by dress steel machine, slab is sent in heating furnace and heated through weighing, after confirmation by shove charge order.
1), in heating furnace, carry out sky stove with other steel grade, empty stove method is as follows:
2), each section of Control for Kiln Temperature is:
One bringing-up section: (target temperature-50 of coming out of the stove) ± 30 DEG C
Two bringing-up sections: (target temperature+20 of coming out of the stove) ± 30 DEG C
Soaking zone: target temperature ± 30 DEG C of coming out of the stove
When heating of plate blank is after design temperature, according to rolling rhythm requirement, by extractor, slab is held out successively, be put on furnace delivery table, be transported to roughing high-pressure water descaling case through roller-way and remove slab scale on surface, be then sent to roughing mill.Slab is rolling 5 passages on roughing mill.
3), roughing mill rolling 5 passage exit thickness 40mm, 970 DEG C of roughing outlet temperatures, roughing Wu road speed is 4.8m/s.
Intermediate blank after roughing rolls through crop flying shear cut made-up belt head, enter mm finishing mill unit after tail and be rolled.
4), first three frame reduction ratio of finish rolling and shut out thickness:
First three frame F0, F1, F2 reduction ratio are respectively 59%, 40%, 37%.
First three frame F0, F1, F2 shut out thickness (mm) and are respectively 20,15,6.5.
5), control finish rolling first three frame inlet temperature and mill speed:
First three frame F0, F1, F2 inlet temperature are respectively 935 DEG C, 920 DEG C, 900 DEG C.
First three frame F0, F1, F2 mill speed (m/s) are respectively 0.9,1.7,2.9.
Being carried out through laminar flow radiator cooler by the band steel on runout table with steel that finishing mill shuts out is cooling, will be cooled to the coiling temperature of regulation by finishing temperature with steel.Cooled band steel is led after centering, pinch roll pinch through coiling machine entrance side, enters into downcoiler and is rolled into coil of strip.Then by coil stripping car, it is shifted out from reel, transport coil of strip to finishing reservoir area buttress by coil conveying chain and walking beam transporter and put.Coil of strip will complete uncoiling, bundling, weighs on step rate, spray printing work.
Empty stove described in the present invention refers to and does not fill steel.For example 3 meters, empty stove has in other words in the segment distance of 3 meters long and does not fill steel.
Claims (1)
1. the milling method of low grade non-oriented silicon steel finishing stands phase transformation, a point bringing-up section, two bringing-up sections, three sections of controls of soaking zone in heating furnace, each section of Control for Kiln Temperature target is:
One bringing-up section: (target temperature-50 of coming out of the stove) ± 30 DEG C;
Two bringing-up sections: (target temperature+20 of coming out of the stove) ± 30 DEG C;
Soaking zone: target temperature ± 30 DEG C of coming out of the stove;
Roughing mill is shut out to thickness and be adjusted to 40mm, roughing mill outlet temperature is adjusted to 965 DEG C, roughing Wu road speed >=4.7m/s;
The reduction ratio that it is characterized in that mm finishing mill unit first three frame F0, F1, F2 is respectively 59%, 40%, 37%;
The thickness that shuts out of mm finishing mill unit first three frame F0, F1, F2 is respectively 20 mm, 15 mm, 6.5 mm;
The inlet temperature of mm finishing mill unit first three frame F0, F1, F2 is respectively 930 DEG C, 920 DEG C, 900 DEG C;
The mill speed of mm finishing mill unit first three frame F0, F1, F2 is respectively 0.9 m/s, 1.7 m/s, 2.9 m/s;
Wherein, F0 is the label of the first frame, and F1 is the label of the second frame, and F2 is the label of the 3rd frame.
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| CN102921725B (en) * | 2012-11-12 | 2015-03-04 | 武汉钢铁(集团)公司 | Non-oriented silicon steel hot rolled plate rolling method controlled through silicon equivalent |
| CN104174660B (en) * | 2014-07-18 | 2016-02-03 | 武汉钢铁(集团)公司 | The zerolling method of flexibility |
| CN108193037B (en) * | 2018-01-12 | 2019-07-26 | 新余钢铁股份有限公司 | One kind preventing orientation silicon steel hot-rolling edge cracking technique |
| CN109365530B (en) * | 2018-10-09 | 2020-09-01 | 鞍钢股份有限公司 | Hot continuous rolling production method of high-grade non-oriented silicon steel |
| CN110193515B (en) * | 2019-05-16 | 2021-04-06 | 山西太钢不锈钢股份有限公司 | Rolling method of austenitic stainless steel hard plate |
| CN110665970B (en) * | 2019-10-08 | 2020-12-25 | 宝武集团鄂城钢铁有限公司 | Production method of GCr15 hot rolled strip steel for spinning |
| CN112246869B (en) * | 2020-09-28 | 2022-04-26 | 马鞍山钢铁股份有限公司 | Control method for shape of excellent hot-rolled oriented silicon steel |
| CN112296102B (en) * | 2020-09-30 | 2022-08-19 | 首钢集团有限公司 | Control method and control device for low-temperature heating of non-oriented silicon steel plate blank |
| CN114433641B (en) * | 2022-01-18 | 2024-03-26 | 安阳钢铁股份有限公司 | Method for improving black ash on surface of hot continuous rolling thick steel for automobile engineering |
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